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What is GPT‑5.3‑Codex‑Spark?

GPT-5.3-Codex-Spark is a specialized, ultra-fast coding model designed to enable real-time collaboration within the Codex platform. As a streamlined variant of GPT-5.3-Codex, it prioritizes latency-sensitive workflows where immediate responsiveness is critical. When deployed on Cerebras’ Wafer Scale Engine 3 hardware, Codex-Spark delivers more than 1000 tokens per second, dramatically accelerating interactive development sessions. The model supports a 128k context window, allowing developers to maintain broad project awareness while iterating quickly. It is optimized for making minimal, precise edits and refining logic or interfaces without automatically executing additional steps unless instructed. OpenAI implemented extensive infrastructure upgrades—including persistent WebSocket connections and inference stack rewrites—to reduce time-to-first-token by 50% and cut client-server overhead by up to 80%. On software engineering benchmarks such as SWE-Bench Pro and Terminal-Bench 2.0, Codex-Spark demonstrates strong capability while completing tasks in a fraction of the time required by larger models. During the research preview, usage is governed by separate rate limits and may be queued during peak demand. Codex-Spark is available to ChatGPT Pro users through the Codex app, CLI, and VS Code extension, with API access for select design partners. The model incorporates the same safety and preparedness evaluations as OpenAI’s mainline systems. This release signals a shift toward dual-mode coding systems that combine rapid interactive loops with delegated long-running tasks. By tightening the iteration cycle between idea and execution, GPT-5.3-Codex-Spark expands what developers can build in real time.

What is Emdash?

Emdash acts as a powerful orchestration layer, enabling the simultaneous execution of multiple coding agents, each within its separate Git worktree, which allows you to tackle diverse subtasks or experiments at the same time without any risk of conflict. Its design is provider-agnostic, giving you the flexibility to choose from a variety of AI models and command-line tools, such as Claude Code and Codex, that align with your particular workflow needs. Through Emdash, you can efficiently assign issues or tickets from popular platforms like Linear, GitHub, or Jira to designated agents, allowing you to monitor their parallel progress in real time. The intuitive user interface features live updates regarding the status and activities of each agent, so when they generate code, you can swiftly review the differences, provide feedback, and initiate pull requests, all seamlessly within the Emdash platform. By ensuring that each agent operates within its own worktree, Emdash keeps changes distinct and comparable, which supports the secure testing of different implementations or strategies side by side. This innovative configuration not only boosts productivity but also fosters a culture of exploration and experimentation, minimizing the chances of code conflicts and allowing for a more dynamic development process. Consequently, users can navigate complex projects with greater ease and confidence.

Media

Media

Integrations Supported

Codex CLI
OpenAI
Amp
Charm
ChatGPT
Claude
Cursor
Gemini
Git
GitHub
GitHub Copilot
Jira
Linear
Microsoft Azure
Microsoft Foundry
OpenAI Codex
OpenCode
Qwen

Integrations Supported

Codex CLI
OpenAI
Amp
Charm
ChatGPT
Claude
Cursor
Gemini
Git
GitHub
GitHub Copilot
Jira
Linear
Microsoft Azure
Microsoft Foundry
OpenAI Codex
OpenCode
Qwen

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided.
Free Trial Offered?
Free Version

Pricing Information

Free
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

OpenAI

Date Founded

2015

Company Location

United States

Company Website

openai.com

Company Facts

Organization Name

Emdash

Company Location

United States

Company Website

www.emdash.sh/

Categories and Features

Categories and Features

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